Discussion
Assertion (A): A clinker microscopist can often say how a kiln was operated without being told.
Reason (R): Crystal size and shape record the temperature and rate of cooling the material experienced.
Answer: B
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason gives the mechanism. Large alite crystals mean a long time at high temperature; rounded belite with lamellar structure means slow cooling; a fine interstitial matrix means rapid cooling. Each feature is a record of a condition the material passed through, so the section can be read as a history of the burn.
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